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electrocorticography

Electrocorticography (ECoG)

Or intracranial EEG (iEEG), is the practice of using electrodes placed directly on the exposed surface of the brain to record electrical activity from the cerebral cortex. ECoG may be performed either in the operating room during surgery (intraoperative ECoG) or outside of surgery (extraoperative ECoG). Because a craniotomy is required to implant the electrode grid, ECoG is an invasive procedure.

The signals recorded by ECOG and Stereoelectroencephalography (SEEG) have very similar spectral power and phase-amplitude coupling, suggesting that both modalities are comparable from an electrodiagnostic standpoint in delineation of the epileptogenic network 1).

see Cortical stimulation.


The detectability of high frequency oscillations (HFO, >200Hz) in the intraoperative ECoG is restricted by their low signal-to-noise ratio (SNR).

Low-noise amplification improves the detection of the evoked high frequency oscillations (HFO, >200Hz) in recordings with subdural electrodes with low impedance 2).

1)
Young JJ, Friedman JS, Panov F, Camara D, Yoo JY, Fields MC, Marcuse LV, Jette N, Ghatan S. Quantitative Signal Characteristics of Electrocorticography and Stereoelectroencephalography: The Effect of Contact Depth. J Clin Neurophysiol. 2019 Mar 26. doi: 10.1097/WNP.0000000000000577. [Epub ahead of print] PubMed PMID: 30925509.
2)
Fedele T, Schönenberger C, Curio G, Serra C, Krayenbühl N, Sarnthein J. Intraoperative subdural low-noise EEG recording of the high frequency oscillation in the somatosensory evoked potential. Clin Neurophysiol. 2017 Jul 27;128(10):1851-1857. doi: 10.1016/j.clinph.2017.07.400. [Epub ahead of print] PubMed PMID: 28826015.
electrocorticography.txt · Last modified: 2019/03/30 18:19 by administrador